Question

the average of 5 positive number is 344. the average of the first two numbers is 650 and the average of the last two numbers is 100. what is the third number.​

Answer 1

Answer:220

Step-by-step explanation:

Sum of 5 numbers=344*5

=1720

Sum of 1st 2 numbers=650*2

=1300

Sum of last 2 numbers=100*2

=200

Sum of 1st 2 numbers +3rd number+ last 2 number =1720

1300+ 3rd number +200=1720

3rd number=1720-1500

3rd number=220

Answer 2

Step-by-step explanation:

Let the third number to be k.

Average of 5 number = 344

Sum of 5 number = 344×5 =1720

.°. Let average of first two(x, y) = 650

Then, sum of x+y = 650×2 =1300. ....... (i)

the average of the last two numbers (s, t) = 100

Then, sum of s+t = 100×2 = 200. ........ (ii)

A/q

Sum of 5 number = 1720

(x+y) +k+(s+t) = 1720. [ substitute value

1300 + k + 200 =1720 from eqⁿ (i) and

1500+k = 1720 (ii) ]

k = 1720 - 1500

= 220

Hence, third number is 220.

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